Trading stocks typically have the lowest fees on eToro, which is one reason why I recommend you stick to this market when starting out.
All trades charge both a spread and daily rollover fees.
It really comes down to individual trading strategies and preference. But to give you an idea, I tend to hold on to stocks for a minimum of 6 months and all other trades tend to have an average duration of about two-three weeks.
A final word on over-trading.

This is a point that I want to expand on a little more, specifically in relation to copying other traders. Below is a screenshot of my equity chart over six months. The red line shows the number of people copying me.
My equity vs copiers chart.
The same holds true for the stock market in general.
Long-term growth of UK stock market.
Useful resources.
How to Start Trading Cryptocurrencies.
Cryptocurrency trading can be extremely profitable if you know what you are doing, but it can also lead to disaster. Even though most traders decide to either go with fiat or bitcoin, other cryptocurrencies can represent viable income sources, as long you as you tread carefully and understand what you are doing. This guide is for those who want to start getting involved in cryptocurrency trading.
Where to trade.